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/*
* Copyright (c) 2013 Miodrag Vallat. <miod@openbsd.org>
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* ``Software''), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/*
* vax Foreign Function Interface
*/
#define LIBFFI_ASM
#include <fficonfig.h>
#include <ffi.h>
.text
/*
* void * %r0
* ffi_call_elfbsd(extended_cif *ecif, 4(%ap)
* unsigned bytes, 8(%ap)
* unsigned flags, 12(%ap)
* void *rvalue, 16(%ap)
* void (*fn)()); 20(%ap)
*/
.globl ffi_call_elfbsd
.type ffi_call_elfbsd,@function
.align 2
ffi_call_elfbsd:
.word 0x00c # save R2 and R3
# Allocate stack space for the args
subl2 8(%ap), %sp
# Call ffi_prep_args
pushl %sp
pushl 4(%ap)
calls $2, ffi_prep_args
# Get function pointer
movl 20(%ap), %r1
# Build a CALLS frame
ashl $-2, 8(%ap), %r0
pushl %r0 # argument stack usage
movl %sp, %r0 # future %ap
# saved registers
bbc $11, 0(%r1), 1f
pushl %r11
1: bbc $10, 0(%r1), 1f
pushl %r10
1: bbc $9, 0(%r1), 1f
pushl %r9
1: bbc $8, 0(%r1), 1f
pushl %r8
1: bbc $7, 0(%r1), 1f
pushl %r7
1: bbc $6, 0(%r1), 1f
pushl %r6
1: bbc $5, 0(%r1), 1f
pushl %r5
1: bbc $4, 0(%r1), 1f
pushl %r4
1: bbc $3, 0(%r1), 1f
pushl %r3
1: bbc $2, 0(%r1), 1f
pushl %r2
1:
pushal 9f
pushl %fp
pushl %ap
movl 16(%ap), %r3 # struct return address, if needed
movl %r0, %ap
movzwl 4(%fp), %r0 # previous PSW, without the saved registers mask
bisl2 $0x20000000, %r0 # calls frame
movzwl 0(%r1), %r2
bicw2 $0xf003, %r2 # only keep R11-R2
ashl $16, %r2, %r2
bisl2 %r2, %r0 # saved register mask of the called function
pushl %r0
pushl $0
movl %sp, %fp
# Invoke the function
pushal 2(%r1) # skip procedure entry mask
movl %r3, %r1
bicpsw $0x000f
rsb
9:
# Copy return value if necessary
tstl 16(%ap)
jeql 9f
movl 16(%ap), %r2
bbc $0, 12(%ap), 1f # CIF_FLAGS_CHAR
movb %r0, 0(%r2)
brb 9f
1:
bbc $1, 12(%ap), 1f # CIF_FLAGS_SHORT
movw %r0, 0(%r2)
brb 9f
1:
bbc $2, 12(%ap), 1f # CIF_FLAGS_INT
movl %r0, 0(%r2)
brb 9f
1:
bbc $3, 12(%ap), 1f # CIF_FLAGS_DINT
movq %r0, 0(%r2)
brb 9f
1:
movl %r1, %r0 # might have been a struct
#brb 9f
9:
ret
/*
* ffi_closure_elfbsd(void);
* invoked with %r0: ffi_closure *closure
*/
.globl ffi_closure_elfbsd
.type ffi_closure_elfbsd, @function
.align 2
ffi_closure_elfbsd:
.word 0
# Allocate room on stack for return value
subl2 $8, %sp
# Invoke the closure function
pushal 4(%ap) # calling stack
pushal 4(%sp) # return value
pushl %r0 # closure
calls $3, ffi_closure_elfbsd_inner
# Copy return value if necessary
bitb $1, %r0 # CIF_FLAGS_CHAR
beql 1f
movb 0(%sp), %r0
brb 9f
1:
bitb $2, %r0 # CIF_FLAGS_SHORT
beql 1f
movw 0(%sp), %r0
brb 9f
1:
bitb $4, %r0 # CIF_FLAGS_INT
beql 1f
movl 0(%sp), %r0
brb 9f
1:
bitb $8, %r0 # CIF_FLAGS_DINT
beql 1f
movq 0(%sp), %r0
#brb 9f
1:
9:
ret
/*
* ffi_closure_struct_elfbsd(void);
* invoked with %r0: ffi_closure *closure
* %r1: struct return address
*/
.globl ffi_closure_struct_elfbsd
.type ffi_closure_struct_elfbsd, @function
.align 2
ffi_closure_struct_elfbsd:
.word 0
# Invoke the closure function
pushal 4(%ap) # calling stack
pushl %r1 # return value
pushl %r0 # closure
calls $3, ffi_closure_elfbsd_inner
ret
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